Add Support for unit32_t rgb values

For example :
uint16_t RGBmatrixPanel::Color333(uint32_t c) {
// RRRrrGGGgggBBBbb

```
uint8_t
r = (uint8_t)(c >> 16),
g = (uint8_t)(c >> 8),
b = (uint8_t)c;
```

return ((r & 0x7) << 13) | ((r & 0x6) << 10) |
((g & 0x7) << 8) | ((g & 0x7) << 5) |
((b & 0x7) << 2) | ((b & 0x6) >> 1);
}

Start by locating the RGBmatrixPanel::Color333 entry point and inspect how color values are currently accepted and converted. Compare the requested uint32_t RGB layout with the existing behavior; done means uint32_t RGB values are supported without breaking the Color333 conversion.

Written by the indexing model from the issue text.